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[trajectory-grader] Implement `recurrence-rate` (Tier 1, rank 9) (#56256)

* Initial plan

* feat: add recurrence-rate trajectory grader

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
C
Copilot committed
efd888040684b37e5e1c48f19c53171ed0d8c6bc
Parent: e9ffa1d
Committed by GitHub <noreply@github.com> on 8/27/2026, 6:38:42 AM